I PRESSED ON THE BRAKES TO AVOID REAR ENDING THE VEHICLE IN FRONT OF ME. THE VEHICLE WOULD NOT SLOW DOWN. I ATTEMPTED TO MOVE INTO THE RIGHT TURN LANE AND THE BRAKES STILL DID NOT ENGAGE. I LOST CONTROL OF THE VEHICLE, TRAVELING SEVERAL YARDS UNTIL THE VEHICLE HIT A TREE. THE AIRBAG NEVER DEPLOYED AND ONSTAR DID NOT ACTIVATE. *TR